Alert archive / Oklahoma / Tornado Watches in 2015
Tornado Watch 36
The Storm Prediction Center issued this tornado watch at Apr 8, 2015, 3:37 PM CDT for 22 counties in Kansas; 31 counties in Oklahoma; 4 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2015, 3:37 PM CDT (20:37 UTC)
- Expired
- Apr 8, 2015, 11:17 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 65 kt
All 57 counties
Allen County, KS, Barber County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Labette County, KS, Marion County, KS, McPherson County, KS, Montgomery County, KS, Neosho County, KS, Reno County, KS, Rice County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Tulsa County, OK, Washington County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Childress County, TX, Collingsworth County, TX, Hall County, TX, Hardeman County, TX
The radar
The Vance AFB radar (KVNX), 48 km from the middle of the area, began a volume at 20:37 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 70%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 90%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
31 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 3:42 PM CDT | Severe Thunderstorm Warning | ICT | Allen, Neosho | 21 min |
| Apr 8, 3:58 PM CDT | Severe Thunderstorm Warning | ICT | Allen | 17 min |
| Apr 8, 4:30 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 30 min |
| Apr 8, 4:32 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 28 min |
| Apr 8, 4:46 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Dewey, Ellis, Roger Mills | 44 min |
| Apr 8, 4:52 PM CDT | Severe Thunderstorm Warning | DDC | Barber | 53 min |
| Apr 8, 4:55 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 35 min |
| Apr 8, 4:57 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods | 33 min |
| Apr 8, 5:21 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods, Woodward | 39 min |
| Apr 8, 5:24 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Ellis, Roger Mills, Woodward | 51 min |
| Apr 8, 5:25 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods | 35 min |
| Apr 8, 5:50 PM CDT | Severe Thunderstorm Warning | ICT | Kingman, Reno | 22 min |
| Apr 8, 5:55 PM CDT | Tornado Warning | OUN | Dewey, Ellis, Roger Mills, Woodward | 50 min |
| Apr 8, 6:15 PM CDT | Tornado Warning | DDC | Barber, Comanche | 30 min |
| Apr 8, 6:41 PM CDT | Tornado Warning | DDC | Barber, Comanche | 34 min |
| Apr 8, 6:42 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Major, Woodward | 29 min |
| Apr 8, 7:07 PM CDT | Tornado Warning | DDC | Barber | 38 min |
| Apr 8, 7:35 PM CDT | Tornado Warning | DDC | Barber | 25 min |
| Apr 8, 7:37 PM CDT | Severe Thunderstorm Warning | ICT | Kingman | 38 min |
| Apr 8, 7:41 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 34 min |
| Apr 8, 7:54 PM CDT | Severe Thunderstorm Warning | ICT | Kingman, Reno, Sedgwick | 51 min |
| Apr 8, 8:11 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Custer, Dewey, Roger Mills | 49 min |
| Apr 8, 8:15 PM CDT | Severe Thunderstorm Warning | ICT | Kingman | 30 min |
| Apr 8, 8:32 PM CDT | Tornado Warning | ICT | Sedgwick | 28 min |
| Apr 8, 8:44 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 31 min |
| Apr 8, 8:46 PM CDT | Severe Thunderstorm Warning | ICT | Kingman, Reno, Sedgwick | 29 min |
| Apr 8, 8:53 PM CDT | Tornado Warning | ICT | Harvey, Sedgwick | 26 min |
| Apr 8, 8:53 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Blaine, Custer, Dewey, Roger Mills | 52 min |
| Apr 8, 8:58 PM CDT | Tornado Warning | OUN | Custer, Dewey | 47 min |
| Apr 8, 9:04 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Foard, Hardeman, Knox, Wilbarger | 56 min |
| Apr 8, 9:42 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer, Dewey | 48 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 8.6 hours before the alert went out and 161 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1989 J/kg
- Mixed-layer CIN
- -278 J/kg
- Mixed-layer LCL
- 931 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 328 m²/s²
- 0-3 km storm-relative helicity
- 298 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
006
WWUS20 KWNS 082040
SEL6
SPC WW 082040
KSZ000-OKZ000-TXZ000-090500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 36
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT WED APR 8 2015
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* TORNADO WATCH FOR PORTIONS OF
SOUTH CENTRAL AND SOUTHEASTERN KANSAS
WESTERN...CENTRAL...AND NORTHERN OKLAHOMA
NORTHWEST TEXAS
* EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 340 PM UNTIL MIDNIGHT
CDT.
* PRIMARY THREATS INCLUDE...
A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE
WIDESPREAD DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
TO 75 MPH POSSIBLE
WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL
EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST OF CLINTON
OKLAHOMA TO 45 MILES NORTH NORTHEAST OF BARTLESVILLE OKLAHOMA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 33...WW 34...WW 35...
DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO DEVELOP ENE ACROSS WW AREA
THROUGH LATE EVE AS CONVERGENCE AND ASCENT FOCUS INVOF DEVELOPING
SRN KS SFC WAVE AND ASSOCIATED STNRY FRONT. MORE ISOLD STORMS
EXPECTED TO FORM SSWWD ALONG TRAILING DRY LINE. TORNADO THREAT MAY
INCREASE AFTER SUNSET AS SSWLY LLJ STRENGTHENS IN RESPONSE TO BOTH
DIURNAL CYCLE AND CONTINUE ENE MOVEMENT OF SWRN U.S. UPR LVL SPEED
MAX.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 25040.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 8:24 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Bourbon, Chautauqua, Cherokee, Cowley, Crawford and 7 more | 5 hr |
| Apr 7, 10:13 PM CDT | Mesoscale Discussion | SPC | Allen, Bourbon, Chautauqua, Cherokee, Crawford, Elk and 5 more | 2 hr |
| Apr 8, 6:17 AM CDT | Mesoscale Discussion | SPC | Bourbon, Linn, Miami | 88 min |
| Apr 8, 2:21 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 12 more | 114 min |
| Apr 8, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 13 more | 4 hr |
| Apr 8, 5:31 PM CDT | Mesoscale Discussion | SPC | Chase, Harvey, Kingman, Marion, Pratt, Reno | 59 min |
| Apr 8, 5:45 PM CDT | Mesoscale Discussion | SPC | Johnson, Miami | 60 min |
| Apr 8, 6:40 PM CDT | Mesoscale Discussion | SPC | Borden, Cottle, Dickens, Fisher, Foard, Garza and 11 more | 65 min |
Nearby
Tornado Watches in Oklahoma, 2015Tornado Watches in Kansas, 2015Tornado Watches in Texas, 2015Every tornado watch in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.